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Experimental Investigation Into the Effects of Rotating and Static Bolts on Both Windage Heating and Local Heat Transfer Coefficients in a Rotor/Stator Cavity PUBLIC ACCESS

[+] Author Affiliations
J. A. Millward, P. H. Robinson

Rolls-Royce plc, Derby, UK

Paper No. 89-GT-196, pp. V001T01A080; 11 pages
doi:10.1115/89-GT-196
From:
  • ASME 1989 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 1: Turbomachinery
  • Toronto, Ontario, Canada, June 4–8, 1989
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7913-9
  • Copyright © 1989 by ASME

abstract

Experiments have been carried out over fully representative ranges of Rotational Reynolds Number Display Formulaρωr2μ and Throughflow Reynolds Number Display Formulam.μr into the effects of single row and multi rows of bolts on both windage and local disc surface heat transfer coefficients. Experiments were carried out on the following combinations; single row rotating, single row static, double row rotating and combined rotating and static. Different sizes of bolts were tested as was variation in pitching and the effects of various bolt shields.

The Adiabatic Wall Temperature (AWT) was measured locally at various positions on the rotor surface both between adjacent bolts and at different pitch circle diameters. Using measured AWT and local rotor surface temperatures the local Nusselt numbers were obtained. In addition an effective Nusselt number for heat transfer into the disc through an actual bolt was obtained by the use of specially instrumented bolts.

In the course of the testing, surprising results were obtained for one particular disc profile. A considerable reduction in windage due to the shape of the disc surface near the rim was measured.

The paper describes the experimental technique used and presents a selection of the windage and heat transfer results.

Copyright © 1989 by ASME
This article is only available in the PDF format.

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